Cologne, Germany. 01st June, 2016. Employee at the Van Ham art auction house, Annika Norpoth, pulls the acrylic painting 'Spirit of Freedom Nr. 10' by Helge Achenbach from a shelf in Cologne, Germany, 01 June 2016. The art consultant Helge Achenbach, who is in custody awaiting trial, has become a painter in prison. The 64-year-old man is auctioning a hand-paintined, large-format Alpine panorama for a good cause on 18 June 2016. Photo: OLIVER BERG/dpa/Alamy Live News
RMG2HWTXCologne, Germany. 01st June, 2016. Employee at the Van Ham art auction house, Annika Norpoth, pulls the acrylic painting 'Spirit of Freedom Nr. 10' by Helge Achenbach from a shelf in Cologne, Germany, 01 June 2016. The art consultant Helge Achenbach, who is in custody awaiting trial, has become a painter in prison. The 64-year-old man is auctioning a hand-paintined, large-format Alpine panorama for a good cause on 18 June 2016. Photo: OLIVER BERG/dpa/Alamy Live News
Customers follow an art auction at the Van Ham auction house in front of paintings by the artist Gerhard Richter in Cologne, Germany, 26 November 2015. Pieces by Gerhard Richter are being auctioned in support of the Duesseldorf-based street magazine 'fiftyfifty' at the Van Ham auction house. Photo: OLIVER BERG/dpa
RMF76KEXCustomers follow an art auction at the Van Ham auction house in front of paintings by the artist Gerhard Richter in Cologne, Germany, 26 November 2015. Pieces by Gerhard Richter are being auctioned in support of the Duesseldorf-based street magazine 'fiftyfifty' at the Van Ham auction house. Photo: OLIVER BERG/dpa
Cologne, Germany. 20th June, 2015. Inside the Van Ham auction house at the insolvency auction of imprisoned art advisor Helge Achenbach in Cologne, Germany, 20 June 2015. 120 valuable pieces are to be auctioned off. PHOTO: ROLF VENNENBERND/DPA/Alamy Live News
RMEW92K1Cologne, Germany. 20th June, 2015. Inside the Van Ham auction house at the insolvency auction of imprisoned art advisor Helge Achenbach in Cologne, Germany, 20 June 2015. 120 valuable pieces are to be auctioned off. PHOTO: ROLF VENNENBERND/DPA/Alamy Live News
Employees at the Van Ham auction house accept bids per phone in front of paintings by the artist Gerhard Richter in Cologne, Germany, 26 November 2015. Pieces by Gerhard Richter are being auctioned in support of the Duesseldorf-based street magazine 'fiftyfifty' at the Van Ham auction house. Photo: OLIVER BERG/dpa
RMF76KEPEmployees at the Van Ham auction house accept bids per phone in front of paintings by the artist Gerhard Richter in Cologne, Germany, 26 November 2015. Pieces by Gerhard Richter are being auctioned in support of the Duesseldorf-based street magazine 'fiftyfifty' at the Van Ham auction house. Photo: OLIVER BERG/dpa
the Van Ham art auction house in the district Bayenthal, Cologne, Germany.  das Kunstauktionshaus Van Ham im Stadtteil Bayenthal, Koeln, Deutschland.
RM2AWKY06the Van Ham art auction house in the district Bayenthal, Cologne, Germany. das Kunstauktionshaus Van Ham im Stadtteil Bayenthal, Koeln, Deutschland.
Employees at the Van Ham auction house accept bids per phone in front of paintings by the artist Gerhard Richter in Cologne, Germany, 26 November 2015. Pieces by Gerhard Richter are being auctioned in support of the Duesseldorf-based street magazine 'fiftyfifty' at the Van Ham auction house. Photo: OLIVER BERG/dpa
RMF76KEEEmployees at the Van Ham auction house accept bids per phone in front of paintings by the artist Gerhard Richter in Cologne, Germany, 26 November 2015. Pieces by Gerhard Richter are being auctioned in support of the Duesseldorf-based street magazine 'fiftyfifty' at the Van Ham auction house. Photo: OLIVER BERG/dpa